Der Hochschuleinkauf steht vor einer gespaltenen Anforderung, die Anbieter selten trennen: Praktikumslabore benötigen Küvetten, die Hunderte unerfahrener Nutzer bei geringstmöglichen Stückkosten überstehen, während Forschungsgruppen optische Präzision, UV-Transmission und kleine Arbeitsvolumina brauchen. Ein Typ für beides bedeutet: zu teuer für die Lehre, unterdimensioniert für die Forschung.

University procurement faces a split requirement that vendors rarely separate: teaching labs need cells that survive hundreds of inexperienced users at the lowest possible unit cost, while research groups need optical precision, UV transmission and small working volumes. Buying one type for both means overpaying for teaching and under-specifying research. This guide separates the two and gives a procurement checklist for each.

1. Praktikumslabore: Robustheit zuerst

Teaching cells get dropped, wiped dry, left full overnight and cleaned with whatever is on the bench. The priorities are therefore:

• Standard 10 mm path — matches every teaching spectrophotometer and every textbook example.
• Reusable, solvent-tolerant material so cleaning mistakes are survivable.
• Low unit cost — breakage is expected, so specify a reorderable standard part, not a matched pair.
• Visible-range assays only in most first and second year practicals, which opens up glass and plastic.

2. Forschungsgruppen: Präzision zuerst

Research work reaches into the UV, uses small volumes, and often requires fluorescence or flow measurement. The specifications that matter:

• Quartz for anything below ~340 nm — nucleic acid and protein A280 work is impossible without it.
• Micro and sub-micro volumes when samples are expensive to produce.
• Four-sided polished cells for fluorescence, where emission is collected at 90°.
• Matched pairs for double-beam instruments and any work where cell-to-cell variation would mask the result.

3. Materialwahl nach Wellenlänge

Material	Usable range	Best for	Relative cost
JGS1 fused silica (quartz)	200 – 2,500 nm	UV, DNA/RNA, protein A280, fluorescence	Highest, but reusable
Optical glass	~340 – 2,500 nm	Visible assays, teaching practicals	Low
Disposable plastic	~340 – 900 nm (typical)	High-throughput visible assays, teaching	Lowest per unit

The decisive question is simple: does any assay go below 340 nm? If yes, quartz is mandatory and the other two are not options. If no, glass or plastic will save real money.

4. Gängige Hochschulassays und die benötigte Küvette

Assay / application	Wavelength	Recommended cell
Nucleic acid quantification	260 nm	Quartz micro, 10 mm
Protein A280	280 nm	Quartz macro, 10 mm
Bradford assay	595 nm	Glass or quartz
BCA assay	562 nm	Glass or quartz
Fluorescence	Ex/Em dependent	Four-sided polished quartz
Kinetics / flow	Varies	Flow cells
Concentrated samples	Varies	Short path cells

5. Beschaffungs-Checkliste

• Split the order — one line for teaching (glass/plastic macro), one for research (quartz, mixed formats).
• Standardise on 10 mm unless a specific method requires otherwise, so cells are interchangeable between instruments.
• Order matched pairs explicitly if using double-beam instruments — this is a separate specification, not automatic.
• Ask for transmission data at your wavelength, not a generic "UV-grade" claim.
• Buy from a supplier that can re-supply the same part in 12 months, so cohorts stay comparable.

6. Eine sinnvolle Grundausstattung

For a department equipping one teaching lab and one shared research instrument:

• Teaching: 20–30 glass or plastic macro cells, 10 mm, reorderable.
• Research: 4 quartz macro cells (10 mm) for UV work, 2 quartz micro cells for small volumes, 1 pair of four-sided fluorescence cells if the instrument supports it.
• Shared: short path cells if concentrated samples are routine.

Adjust volumes upward if teaching cohorts are large — breakage, not wear, is what consumes teaching stock.

Related: Cleaning Protocol · UV-Vis Troubleshooting · Solvent Compatibility · Path Length Guide · Path Length Calculator · Cuvette Care Guide